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Technical Articles

Java

javaTutorial

Java implements random letter combination generation

This article details how to efficiently generate random case Latin combinations in Java. By leveraging the ASCII code characteristics of the Math.random() function and characters, we can precisely control the range and type of generated letters. The tutorial provides clear code examples and deeply analyzes core concepts such as random number generation, type conversion, and character operations. It also explores advanced techniques for generating mixed upper and lower case characters and random strings of specified lengths.

Aug 16, 2025 am 02:57 AM

What are constructors in Java?

ConstructorsinJavaarespecialmethodsusedtoinitializeobjectswhenthey'recreated,ensuringpropersetupbeforeuse.1.Theyhavethesamenameastheclassandnoreturntype.2.Theyrunautomaticallywhenanobjectisinstantiatedwiththenewkeyword.3.Typesincludedefault(provideda

Aug 16, 2025 am 02:51 AM

java Constructor

Mastering Object-Oriented Design in Java

MasterthefourpillarsofOOPbyapplyingencapsulationtoenforcebusinessrules,abstractiontodefineclearcontracts,inheritanceonlyfortrueis-arelationships,andpolymorphismforruntimebehaviorselection;2.ApplySOLIDprinciplesbyensuringsingleresponsibilities,extendi

Aug 16, 2025 am 02:26 AM

How to write a unit test with JUnit in Java

AddJUnitdependencyviaMavenorGradle.2.Createaclasstotest,suchasCalculatorwithaddanddividemethods.3.Writetestmethodsannotatedwith@Test,usingassertionslikeassertEqualsandassertThrowstoverifybehavior.4.RunteststhroughIDE,Maven,orGradle,ensuringallasserti

Aug 16, 2025 am 01:50 AM

unit test junit

How to use input and output streams in Java

JavaI/Ostreamsareessentialforhandlingdatainputandoutputefficiently.1.UseInputStreamandOutputStreamforbyte-baseddata,suchasbinaryfiles,withFileInputStreamandFileOutputStreamforreadingandwriting.2.UseReaderandWriterforcharacter-baseddatatoproperlyhandl

Aug 16, 2025 am 01:40 AM

java 輸入輸出流

What is method overloading in Java?

MethodoverloadinginJavaallowsmultiplemethodswiththesamenamebutdifferentparameters,enablingcleaner,morereusablecodebyvaryingthenumber,type,ororderofparameters;itisresolvedatcompiletimeandsupportspolymorphism,asseeninbothregularmethodsandconstructors,w

Aug 16, 2025 am 12:45 AM

How do you correctly clone an object in Java?

ThecorrectwaytocloneanobjectinJavadependsontheobject’sstructureandmutability,withshallowcloningusingtheclone()methodbeingsuitableonlyforsimplecaseswithnomutablereferences.2.Forobjectscontainingmutablefieldslikelistsornestedobjects,deepcloningisrequir

Aug 16, 2025 am 12:39 AM

Java Streams: Efficiently extract and flatten collection values from Map

This article explores in-depth how Java Streams can be used to efficiently extract the set value corresponding to a specific key from a Map and flatten it into a Stream. The article details three core methods: map.getOrDefault().stream(), flatMap() and mapMulti() introduced in Java 16, and provides corresponding code examples and usage scenario analysis, aiming to help developers optimize data processing processes, avoid unnecessary full Map iteration, and improve code performance and readability.

Aug 16, 2025 am 12:36 AM

What is a record in Java?

ArecordinJavaisaconcisewaytorepresentimmutabledatacarriers,introducedasapermanentfeatureinJava16.2.Itautomaticallygeneratesconstructors,accessors,equals,hashCode,andtoStringmethodsbasedonthefieldsdeclaredintherecordheader.3.Recordsareimmutable,transp

Aug 16, 2025 am 12:18 AM

java record

Accessing data members of parent activity in child activity in Android

This article will describe how to access data members of a parent activity from a launched child activity in an Android application. We will explore the method of using ViewModel to extract business logic into ViewModel, thereby realizing data sharing and avoiding the problems caused by direct access to the parent Activity object.

Aug 15, 2025 pm 02:45 PM

Spring Singleton Bean Memory Management: Lifecycle, Occupancy and Optimization Strategies

This article deeply explores the memory management mechanism and life cycle of Singleton Beans in the Spring framework. Revealing the resident characteristics of singleton beans in the application context and their actual impact on memory usage, especially distinguishing between stateless and stateful beans. The article emphasizes that singleton beans are not usually recycled by GC and provides caching strategies for stateful data management to optimize memory usage.

Aug 15, 2025 pm 02:39 PM

Best practices for saving information in Java programs

This article discusses the best way to save user modification information in Java programs, especially when the program needs to read and modify files located in the src/main/resources directory. Since it is impossible to directly write resource files in JAR packages at runtime, this article will introduce a method that utilizes streams and buffered readers to save the modified data to files in the same directory as the JAR package, thereby ensuring the availability of the program on any computer.

Aug 15, 2025 pm 02:30 PM

Positioning Java runtime annotation processing logic: efficient debugging method

This article aims to solve the common problem of how to locate the processing logic of third-party libraries for runtime annotations in Java development. When the standard IDE lookup function cannot meet the needs, we provide an efficient debugging strategy: by setting conditional breakpoints on the Class.isAnnotationPresent method and filtering with the target annotation type, developers can accurately track the actual processing location of the annotation, thereby deeply understanding its underlying mechanism.

Aug 15, 2025 pm 02:27 PM

Android TextView background color dynamic switching: based on text content

This article will introduce how to dynamically change the background color of the TextView in an Android application based on the text content of the TextView. By listening to text changes and using the setBackgroundColor() method, the background color can be updated in real time with the text status without restarting the activity. We will provide detailed code examples and notes to help developers implement this feature easily.

Aug 15, 2025 pm 02:15 PM